The cheapest valid option is the lowest total cost for a service that accepts the real package and meets your evidence needs. A headline from a different size, route or handover method is not a usable comparison.
Pack the item, weigh it and measure all three external dimensions. Couriers may use dimensional rules, while postal products use format and service limits; inaccurate inputs can invalidate a low quote.
Include packaging weight
Measure the largest points
Check maximum side and combined limits
Match drop-off and collection
A ParcelShop or post-office drop-off price is not directly comparable with a door collection. Include travel, pickup charges, failed-collection risk and the locations actually available to you.
Check opening hours
Confirm accepted parcel sizes
Price collection only when it saves enough time
Match tracking and cover
Compare services with equivalent delivery evidence and compensation conditions. The lowest untracked rate may be poor value for a sale that can be refunded after a delivery dispute.
Read prohibited and excluded goods
Check proof-of-delivery terms
Use appropriate packaging
Move repeat volume to quotes
Regular senders should compare account rates, fuel or remote surcharges, collections, returns and software time. Public counter prices are useful benchmarks but not a complete business cost model.
Use a representative shipment mix
Ask for the full surcharge schedule
Review rates against actual invoices
How to get it right
Create the shipment facts: Record destination, dimensions, weight, contents and value.
Set minimum service needs: Choose acceptable tracking, delivery and cover.
Compare final checkouts: Use the same facts across An Post and eligible couriers.
Keep evidence: Buy the valid option and retain the acceptance receipt and tracking.
Official sources
Rules, availability and rates can change. Confirm the live details before buying postage.